Rack-cutting attachment for fellows gear-cutters



C. L. NADON.

RACK CUTTING ATTACHMENT FOR FELLows GEAR CUTTERS.

APPLICATIONTILED MAR. l, |919.

Patented Feb. 17,1920.

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RACK CUTTTNG ATTACHMENT TOR FELLows GEAR CUTTERS.

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RACK CUTTING ATTACHMENT FOR FELLOWS GEAR CUTTERS.

, 1919. 1,330,949. Peeented Feb.17,1920.

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Z0 z'eases TNITED STATES PATENT OFFICE.

' CAMILLE L. NAIBON, OF MINNEAPOLIS, MINNESOTA, ASSIGNOR 0F ONE-HALF T0 ALBERT L. SINCLAIE, OF MINNEAPOLIS', MINNESOTA.

RACK-CUTTING ATTACHMENT FR FELIIOWS GEAR-CUTTERS.

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Application filed March 1, 1919.

To (zZ/ wwm 'it may concern Be it known that I, CAMLLLE Ii. NADON, a'citizen or" the TUnited States, residing at Minneapolis, in the County of Hennepin and State of Minnesota, have invented certain new and useful Improvements in Rack-Cutting Attachment for Fellows Gear-Cutters; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

My invention provides certain improvements on or attachments to gear shapers of the general type exempliiied by the construction employed in the commercially well known Fellows gear shaper, whereby the teeth may be out on racks or straight bars.

In the said Fellows gear shaper, the blank gear is secured to a mandrel that is given rotary movements, and the teeth are cut on the blank gear thatv is carried by this mandrel by a gear-shaped cutter that is rotated in synchronism with the said blank gear but is given reciprocating movements in a direction parallel to the aXis of the blank gear and its holding mandrel.

Hitherto, it has not been possible to cut racks on gear shapers of the above type, and for the cutting of racks, independent and expensive machines have been provided.

My invention provides an extremely simple attachment whereby a gear shaper of the Fellows -type may be quickly converted into an eflicient rack cutter or shaper. In making this transformation, I place a completed working spur gear 0n the holding mandrel as a substitute for a blank gear, and I provide a sliding` vise that is equipped with a rack that is arranged to run in mesh with the said driving gear thus substituted for the blank gear. This vise is mounted for straight line movements, is adapted to hold one or more blank rack bars and, as it is moved intermittently by the holding man* drel through the substituted rack and gear, it will properly present the blank rack to the reciprocating rotary gear cutter, which latter, in the Fellows gear shaper, operates directly on the blank gear carried by the holding mandrel.

Nith the above general statements in mind, the rack cutting attachment will now be described more in detail, the same being illustrated in the accompanying drawings Specification of Letters Patent.

Patented Feb. 17, 1920.

Serial No. 280,135.

wherein like characters indicate like parts throughout the several views.

Referring to the drawings,

Figure 1 is a front elevation illustrating my rack cutting attachment applied to a Fellows gear Shaper;

Fig. 2 is an elevation looking at the parts shown in Fig. 1 in a direction from the left toward the right, some parts being removed;

Fig. 3 is a detail in vertical section on the line 3 3 of Fig. 1, some parts being removed; Y

Fig. 4 is a fragmentary horizontal section on the line 4 4 of Fig. 2;

Fig. 5 is a fragmentary view in rear elevation showing a portion of the sliding rack vise; and

Fig. 6 is an end elevation of the parts shown in Fig. 5.

The standard parts of the Fellows gear shaper, in so far as they are here shown, are as follows:

The numeral 7 indicates the main frame and the numeral 8 the head block mounted for vertical movements on the said frame in a well known way. The carrying mandrel 9, which, at its upper end, is usually empioyed to hold and rotate the blank gear while it is being cut, is rotatively mounted in a crosshead 10. The gear-like gear cutter 11 is, or may be the same as usually employed, and will be secured to the lower end of a carrying spindle 12 that is carried vertically with but rotatably mounted in the verticallv reciprocating head 8 in the usual way. The mandrel 9 and spindle 12 will be connected to rotate in synchronism, preferably by 'means usually employed, and the customary means for vertically reciprocating thehead 8 may be also assumed to be employed. The crosshead 10 is mounted to slide horizontally on a crosshead guide 13 rigidly supported bv the main frame 7 In the application of my attachment. I provide the crosshead 10 with a modified form of head block, this head block being indicated as an entirety by the numeral 14, and it contains the bearing 15 for the upper end of the carrying mandrel 9. This head block has a slotted lug that is rigidly but detachably secured bv a nut-equipped stud 16 to the sleeve 10a of the crosshead 10.r On that face that is adjacent to the gear cutter 11, the head block 14 is formed with a horizontal guideway that closely fits and accurately horizontally guides the vise 17 for holding the blank racks. long horizontally extended structure, and on its back it has a rigidly secured horizontal rack 18 that meshes with the gear 19 that is rigidly secured to the upper end of the mandrel 9. IIere attention is recalled to the fact that this gear 19 is the gear that is applied'to the mandrel 9 as a substitute for the blank gear in the Fellows gear shaper.

By reference particularly to Figs. 2 and 3, it will be noted that the head block 14- and vise 17 have dove-tailed sliding engage- Yment: at 2O and are detachably interlocked and held together by a o'uide strip 21 rigidly secured'to said head block by screws 22. The extended portionsof the vise are preferably arranged to run over anti-friction rollers 23 and 24 supported by guide brackets 25 and 26, respectively, on the main frame 7.

The blank racks Y, when placed in the vise, rest on the projecting horizontal ledge V17 thereof and are clamped thereto by a clamping bar 27 which, in turn, is clamped Vdown between the alreadyV formed teeth oil in position by set screws 28 and nut-equipped bolts 29. The set screws 28 work vertically through the upper iiange of the vise while the nut-equipped ends oi the bolts- 29 work in T-shaped grooves 30 formed in the vertical face 01' the vise.

Frequently, racks will be cut that are of a length longer thanthe vise and which will requirey shifting several times during the cutting operation. To insure accurate resetting and alinement of the teeth of the several racks that are being simultaneously eut, Iprovide adevice best shown in Figs. 5 and 6, and which device is in the nature of a U-shaped alining bar 31, the prongs of` which are adjustably held by set screws 32 in lugs 38 secured on one end of the vise. Preferably these lugs 33V have stems 3a telescoped into holes in the vise and detachably held by set screws y When the transverse portion of theV alining bar 3l is pressed thev partly cut racks, it will insure perfect alinement oi the teeth of the two racks.

Y The operation of this rack cutting attach-VV ment must be obvious from the foregoing description. Each step of rotary movement imparted to the gear 19, and which movement corresponds to the movement given to the-blank gear in the Fellows'gear cutter, will impart one tooth space of movement tothe blank racks, and, consequently, the` This vise 17 is a Y What I claim is: Y

l. In a gear shaper oi the type described, the combination with a reciprocating rotary cutter and a rotary carrying mandrel equipped with a driving pinion, of a rackholding vise mounted for sliding movements to carry blank racks in position to be cut by said reciprocating rotary cutter, and a rack on said vise meshing with the driving gear on said mandrel. Y

In a gear shaper of the type described, the combination with a reciprocating rotary cutter and a. rotary carrying mandrel equipped with a driving' pinion, of a rackholding vise mounted for sliding movements to carry blank racks in position to be cut by said reciprocating rotary cutter, and a rack on said vise meshing with'the driving gear on.said mandrel, the support Jfor said cutter.

3. The combination with the reciprocating Y rotary gear cutter and the rotary blank gear supporting mandrel of a gear shaper of the Fellows type, oi a driving gear applied to said mandrel as a substitute for the blank gear employed in gear cutting, and a blank rack supporting ,vise mounted for straight line'sliding movements and having a rack tor meshing withrthe driving gear on said mandrel. i

.4. The combination with the reciprocating rotary gear cutter' and the rotary blank gear supporting mandrel of a gear sha-per of the Fellowstype, off a driving gear applied to said mandrel as a substitute Jr'or the blank gear employed in gear cutting, and a blankV rack supporting vise mounted for straight line sliding movements and having a rack for meshing with the driving gear on said mandrel, the support for said mandrel and vise being adjustable toward and from said gear cutter. Y

5. A rack cutting attachment for gear Shapers o' the Fellows type comprising a rotary mandrehaY vise guiding head that atlords also a bearing for the upper end of the said rotary mandrel which, inthe gear cutting action, is adapted to carry the blank gear, a driving gear applicable ,to said Ina-ndrel as a substitute for the blank gear, and a blank rack holding .vise mounted for straight line sliding movements on said head block and having a rack meshing with said driving gear. y

In testimony whereof I aiiix my Ysignature in presence of two witnesses. Y

CAMILLE L. NADON.

llfvitnesses: Y Y

F. D. MERCHANT, CLARA Dnivrauns'r.Y 

